Mercury-pump.



PATENTED APR. 9, 1907.

l P. c. HEWITT.

MERCURY PUMP.

l APPLICATION FILED MAY 27. 1904.

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PETER COOPER HEWITT, OF NEW YORK, NQY., ASSIGNOR TO COOPER Hnwirr snnormo COMPANY, o or Nnw Yoeri. y

F NEW YORK, N. Y., A CORPORATION MERCURY-PUMP.

No. stessa.

Specieaton'of Letters Patent.

Patented April 9, 1907.

Application filed May 27, 1904;. Serial No. 210,078.

To all whom it mag/concern:

Be it known that I, PETER COOPER HEW- ITT, a citizen of the United States, anda resident of New York, county of New York, State of New York, have invented certain new and useful Improvements in Mercury- Iumps, of'which the following is a specification. f

I have found that by making the fall-tube of a mercury-pump of such shape and arrangement that the energy' acquired by the falling mercury is made tc expend itself in friction, thus obviating the water-hanfnnerv effect inthe tube, the life of the fall-tube may be materially prolonged and a greater distance of fall can be obtained, and consequently a more rapid operation of the pump, withoutl passing the breaking limit of the tube when of glass. Tothis end I cause the mercury to fall into a small uddle of mern cury in a bulb, which bulb s ould be interposed. in the fall-tube at a reasonable distance above the barometric height, somewhere about three inches to siX inches, de-

pending on the quality of the glass and the A l bore of the tube, or I cause the mercury to strike tangentially4 upon a body of mercury in the fall-tube.`

My invention will be understood by referring to the accompanying drawings, in Whichl Figures 1 and 2 illustrate two modes ofcarrying out my invention.

Referring to the rst figure of the drawings, 1 is a fall-tube between the ends of which is interposed a bulb 2. This bulb is located in the fall-tube at a point some three to sixV inches above the barometric height. The upper part of the fall-tube is made spiral in shape where it enters the bulb 2, as shown at 3. The mercury passing down the upper y part of the tube 1 is thus caused to enter the bulb on a curve and acts tangentially upon any mercury which may accumulate in the lower part of the said bulb. Thereby a twirling movement of the mercury is produced in the lower part of the tube l, tending to produce a vortex and calculated to cause the mercury to fall through a greater distance than if the fall took place in a straight In Fig. 2 the bulb 2 is differently placed with respect to the upper and lower parts of the fall-tube 1, being so disposed as to permit a mass or puddle 4 of mercury to accumulate in the bottom of the bulb. The lower part of the tube 1 is tapered from the point where i it leaves the bulb 2 to a point, as 5, where it becomes of the same 'diameter as the tube -1 above the bulb. I find that the mercury falling from the upper part of Vthe tube 1 from the puddle 4 and passing out from the pumping action which is in excess of the ordinary action in fall-tubes. The puddle 4 overilows into the lower tube 1, and as the gas. is much denser in the bulb 2 than in the lower tube, due to thepheight of the fall-tube above the bulb, the pumping capacity of the lower part of the tube is ample to carry away all of the gases brought there through the upper part thereof. The same efl'ect as to the carrying away of the gases is produced by the construct-ion illustrated in Fig. 1.

vI claim as my invention- 1. A fall-tube for mercury-punu'is having enlarged lower part of the tube produces a the point where it is connected with the bulb being of larger diameter than the upper part of the fall-tube.

Signed at New York, in the county of New York and State of New York, this 23d day of May, A. D. 1904.

PETER oooPER HEWITT.

Witnesses R. A. Hnwrr'r, WM. H. CAPEL. 

